drivers/dma/dw-edma/dw-edma-v0-debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
   4  * Synopsys DesignWare eDMA v0 core
   5  *
   6  * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
   7  */
   8
   9 #include <linux/debugfs.h>
  10 #include <linux/bitfield.h>
  11
  12 #include "dw-edma-v0-debugfs.h"
  13 #include "dw-edma-v0-regs.h"
  14 #include "dw-edma-core.h"
  15
  16 #define REGS_ADDR(name) \
  17         ((void __force *)&regs->name)
  18 #define REGISTER(name) \
  19         { #name, REGS_ADDR(name) }
  20
  21 #define WR_REGISTER(name) \
  22         { #name, REGS_ADDR(wr_##name) }
  23 #define RD_REGISTER(name) \
  24         { #name, REGS_ADDR(rd_##name) }
  25
  26 #define WR_REGISTER_LEGACY(name) \
  27         { #name, REGS_ADDR(type.legacy.wr_##name) }
  28 #define RD_REGISTER_LEGACY(name) \
  29         { #name, REGS_ADDR(type.legacy.rd_##name) }
  30
  31 #define WR_REGISTER_UNROLL(name) \
  32         { #name, REGS_ADDR(type.unroll.wr_##name) }
  33 #define RD_REGISTER_UNROLL(name) \
  34         { #name, REGS_ADDR(type.unroll.rd_##name) }
  35
  36 #define WRITE_STR                               "write"
  37 #define READ_STR                                "read"
  38 #define CHANNEL_STR                             "channel"
  39 #define REGISTERS_STR                           "registers"
  40
  41 static struct dentry                            *base_dir;
  42 static struct dw_edma                           *dw;
  43 static struct dw_edma_v0_regs                   __iomem *regs;
  44
  45 static struct {
  46         void                                    __iomem *start;
  47         void                                    __iomem *end;
  48 } lim[2][EDMA_V0_MAX_NR_CH];
  49
  50 struct debugfs_entries {
  51         const char                              *name;
  52         dma_addr_t                              *reg;
  53 };
  54
  55 static int dw_edma_debugfs_u32_get(void *data, u64 *val)
  56 {
  57         void __iomem *reg = (void __force __iomem *)data;
  58         if (dw->mode == EDMA_MODE_LEGACY &&
  59             reg >= (void __iomem *)&regs->type.legacy.ch) {
  60                 void __iomem *ptr = &regs->type.legacy.ch;
  61                 u32 viewport_sel = 0;
  62                 unsigned long flags;
  63                 u16 ch;
  64
  65                 for (ch = 0; ch < dw->wr_ch_cnt; ch++)
  66                         if (lim[0][ch].start >= reg && reg < lim[0][ch].end) {
  67                                 ptr += (reg - lim[0][ch].start);
  68                                 goto legacy_sel_wr;
  69                         }
  70
  71                 for (ch = 0; ch < dw->rd_ch_cnt; ch++)
  72                         if (lim[1][ch].start >= reg && reg < lim[1][ch].end) {
  73                                 ptr += (reg - lim[1][ch].start);
  74                                 goto legacy_sel_rd;
  75                         }
  76
  77                 return 0;
  78 legacy_sel_rd:
  79                 viewport_sel = BIT(31);
  80 legacy_sel_wr:
  81                 viewport_sel |= FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
  82
  83                 raw_spin_lock_irqsave(&dw->lock, flags);
  84
  85                 writel(viewport_sel, &regs->type.legacy.viewport_sel);
  86                 *val = readl(ptr);
  87
  88                 raw_spin_unlock_irqrestore(&dw->lock, flags);
  89         } else {
  90                 *val = readl(reg);
  91         }
  92
  93         return 0;
  94 }
  95 DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, dw_edma_debugfs_u32_get, NULL, "0x%08llx\n");
  96
  97 static void dw_edma_debugfs_create_x32(const struct debugfs_entries entries[],
  98                                        int nr_entries, struct dentry *dir)
  99 {
 100         int i;
 101
 102         for (i = 0; i < nr_entries; i++) {
 103                 if (!debugfs_create_file_unsafe(entries[i].name, 0444, dir,
 104                                                 entries[i].reg, &fops_x32))
 105                         break;
 106         }
 107 }
 108
 109 static void dw_edma_debugfs_regs_ch(struct dw_edma_v0_ch_regs __iomem *regs,
 110                                     struct dentry *dir)
 111 {
 112         int nr_entries;
 113         const struct debugfs_entries debugfs_regs[] = {
 114                 REGISTER(ch_control1),
 115                 REGISTER(ch_control2),
 116                 REGISTER(transfer_size),
 117                 REGISTER(sar_low),
 118                 REGISTER(sar_high),
 119                 REGISTER(dar_low),
 120                 REGISTER(dar_high),
 121                 REGISTER(llp_low),
 122                 REGISTER(llp_high),
 123         };
 124
 125         nr_entries = ARRAY_SIZE(debugfs_regs);
 126         dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, dir);
 127 }
 128
 129 static void dw_edma_debugfs_regs_wr(struct dentry *dir)
 130 {
 131         const struct debugfs_entries debugfs_regs[] = {
 132                 /* eDMA global registers */
 133                 WR_REGISTER(engine_en),
 134                 WR_REGISTER(doorbell),
 135                 WR_REGISTER(ch_arb_weight_low),
 136                 WR_REGISTER(ch_arb_weight_high),
 137                 /* eDMA interrupts registers */
 138                 WR_REGISTER(int_status),
 139                 WR_REGISTER(int_mask),
 140                 WR_REGISTER(int_clear),
 141                 WR_REGISTER(err_status),
 142                 WR_REGISTER(done_imwr_low),
 143                 WR_REGISTER(done_imwr_high),
 144                 WR_REGISTER(abort_imwr_low),
 145                 WR_REGISTER(abort_imwr_high),
 146                 WR_REGISTER(ch01_imwr_data),
 147                 WR_REGISTER(ch23_imwr_data),
 148                 WR_REGISTER(ch45_imwr_data),
 149                 WR_REGISTER(ch67_imwr_data),
 150                 WR_REGISTER(linked_list_err_en),
 151         };
 152         const struct debugfs_entries debugfs_unroll_regs[] = {
 153                 /* eDMA channel context grouping */
 154                 WR_REGISTER_UNROLL(engine_chgroup),
 155                 WR_REGISTER_UNROLL(engine_hshake_cnt_low),
 156                 WR_REGISTER_UNROLL(engine_hshake_cnt_high),
 157                 WR_REGISTER_UNROLL(ch0_pwr_en),
 158                 WR_REGISTER_UNROLL(ch1_pwr_en),
 159                 WR_REGISTER_UNROLL(ch2_pwr_en),
 160                 WR_REGISTER_UNROLL(ch3_pwr_en),
 161                 WR_REGISTER_UNROLL(ch4_pwr_en),
 162                 WR_REGISTER_UNROLL(ch5_pwr_en),
 163                 WR_REGISTER_UNROLL(ch6_pwr_en),
 164                 WR_REGISTER_UNROLL(ch7_pwr_en),
 165         };
 166         struct dentry *regs_dir, *ch_dir;
 167         int nr_entries, i;
 168         char name[16];
 169
 170         regs_dir = debugfs_create_dir(WRITE_STR, dir);
 171         if (!regs_dir)
 172                 return;
 173
 174         nr_entries = ARRAY_SIZE(debugfs_regs);
 175         dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
 176
 177         if (dw->mode == EDMA_MODE_UNROLL) {
 178                 nr_entries = ARRAY_SIZE(debugfs_unroll_regs);
 179                 dw_edma_debugfs_create_x32(debugfs_unroll_regs, nr_entries,
 180                                            regs_dir);
 181         }
 182
 183         for (i = 0; i < dw->wr_ch_cnt; i++) {
 184                 snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
 185
 186                 ch_dir = debugfs_create_dir(name, regs_dir);
 187                 if (!ch_dir)
 188                         return;
 189
 190                 dw_edma_debugfs_regs_ch(&regs->type.unroll.ch[i].wr, ch_dir);
 191
 192                 lim[0][i].start = &regs->type.unroll.ch[i].wr;
 193                 lim[0][i].end = &regs->type.unroll.ch[i].padding_1[0];
 194         }
 195 }
 196
 197 static void dw_edma_debugfs_regs_rd(struct dentry *dir)
 198 {
 199         const struct debugfs_entries debugfs_regs[] = {
 200                 /* eDMA global registers */
 201                 RD_REGISTER(engine_en),
 202                 RD_REGISTER(doorbell),
 203                 RD_REGISTER(ch_arb_weight_low),
 204                 RD_REGISTER(ch_arb_weight_high),
 205                 /* eDMA interrupts registers */
 206                 RD_REGISTER(int_status),
 207                 RD_REGISTER(int_mask),
 208                 RD_REGISTER(int_clear),
 209                 RD_REGISTER(err_status_low),
 210                 RD_REGISTER(err_status_high),
 211                 RD_REGISTER(linked_list_err_en),
 212                 RD_REGISTER(done_imwr_low),
 213                 RD_REGISTER(done_imwr_high),
 214                 RD_REGISTER(abort_imwr_low),
 215                 RD_REGISTER(abort_imwr_high),
 216                 RD_REGISTER(ch01_imwr_data),
 217                 RD_REGISTER(ch23_imwr_data),
 218                 RD_REGISTER(ch45_imwr_data),
 219                 RD_REGISTER(ch67_imwr_data),
 220         };
 221         const struct debugfs_entries debugfs_unroll_regs[] = {
 222                 /* eDMA channel context grouping */
 223                 RD_REGISTER_UNROLL(engine_chgroup),
 224                 RD_REGISTER_UNROLL(engine_hshake_cnt_low),
 225                 RD_REGISTER_UNROLL(engine_hshake_cnt_high),
 226                 RD_REGISTER_UNROLL(ch0_pwr_en),
 227                 RD_REGISTER_UNROLL(ch1_pwr_en),
 228                 RD_REGISTER_UNROLL(ch2_pwr_en),
 229                 RD_REGISTER_UNROLL(ch3_pwr_en),
 230                 RD_REGISTER_UNROLL(ch4_pwr_en),
 231                 RD_REGISTER_UNROLL(ch5_pwr_en),
 232                 RD_REGISTER_UNROLL(ch6_pwr_en),
 233                 RD_REGISTER_UNROLL(ch7_pwr_en),
 234         };
 235         struct dentry *regs_dir, *ch_dir;
 236         int nr_entries, i;
 237         char name[16];
 238
 239         regs_dir = debugfs_create_dir(READ_STR, dir);
 240         if (!regs_dir)
 241                 return;
 242
 243         nr_entries = ARRAY_SIZE(debugfs_regs);
 244         dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
 245
 246         if (dw->mode == EDMA_MODE_UNROLL) {
 247                 nr_entries = ARRAY_SIZE(debugfs_unroll_regs);
 248                 dw_edma_debugfs_create_x32(debugfs_unroll_regs, nr_entries,
 249                                            regs_dir);
 250         }
 251
 252         for (i = 0; i < dw->rd_ch_cnt; i++) {
 253                 snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
 254
 255                 ch_dir = debugfs_create_dir(name, regs_dir);
 256                 if (!ch_dir)
 257                         return;
 258
 259                 dw_edma_debugfs_regs_ch(&regs->type.unroll.ch[i].rd, ch_dir);
 260
 261                 lim[1][i].start = &regs->type.unroll.ch[i].rd;
 262                 lim[1][i].end = &regs->type.unroll.ch[i].padding_2[0];
 263         }
 264 }
 265
 266 static void dw_edma_debugfs_regs(void)
 267 {
 268         const struct debugfs_entries debugfs_regs[] = {
 269                 REGISTER(ctrl_data_arb_prior),
 270                 REGISTER(ctrl),
 271         };
 272         struct dentry *regs_dir;
 273         int nr_entries;
 274
 275         regs_dir = debugfs_create_dir(REGISTERS_STR, base_dir);
 276         if (!regs_dir)
 277                 return;
 278
 279         nr_entries = ARRAY_SIZE(debugfs_regs);
 280         dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
 281
 282         dw_edma_debugfs_regs_wr(regs_dir);
 283         dw_edma_debugfs_regs_rd(regs_dir);
 284 }
 285
 286 void dw_edma_v0_debugfs_on(struct dw_edma_chip *chip)
 287 {
 288         dw = chip->dw;
 289         if (!dw)
 290                 return;
 291
 292         regs = dw->rg_region.vaddr;
 293         if (!regs)
 294                 return;
 295
 296         base_dir = debugfs_create_dir(dw->name, NULL);
 297         if (!base_dir)
 298                 return;
 299
 300         debugfs_create_u32("version", 0444, base_dir, &dw->version);
 301         debugfs_create_u32("mode", 0444, base_dir, &dw->mode);
 302         debugfs_create_u16("wr_ch_cnt", 0444, base_dir, &dw->wr_ch_cnt);
 303         debugfs_create_u16("rd_ch_cnt", 0444, base_dir, &dw->rd_ch_cnt);
 304
 305         dw_edma_debugfs_regs();
 306 }
 307
 308 void dw_edma_v0_debugfs_off(void)
 309 {
 310         debugfs_remove_recursive(base_dir);
 311 }